Monochrome palette
Marble Oasis
From #00505b ink through #007b8b, #3396a7, #57a4b2 to #73c0cf light, Marble Oasis is a split-complementary progression that holds together at any size. Use it for hotel key cards and lobby signage in one system. The darkest and lightest stops clear AA for large text.
cyanmonochromefive-stop
#00505b
#007b8b
#3396a7
#57a4b2
#73c0cf
The generator opens with #00505b as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.